conformtest: correct set of standards for which more headers are tested.

conformtest: correct set of standards for which more headers are tested.

Continuing the corrections to which headers conformtest tests for
which standards, this patch corrects conformtest mistakes regarding
which headers to test for the remaining standards (XOPEN2K POSIX2008
XOPEN2K8).  Tested x86_64.

2014-03-05  Joseph Myers  <joseph@codesourcery.com>

	* conform/data/netinet/tcp.h-data [POSIX2008 || XOPEN2K8]: Enable
	whole file.
	* conform/data/sys/timeb.h-data [POSIX2008 || XOPEN2K8]: Disable
	whole file.
	* conform/data/sys/uio.h-data [POSIX2008]: Likewise.
	* conform/data/ucontext.h-data [POSIX2008 || XOPEN2K8]: Likewise.